docs: def get_index(self, index, startkey, endkey=None, return_terms=None,
                    max_results=None, continuation=None, timeout=None,
                    term_regex=None):
          """
          Queries a secondary index over objects in this bucket,
          returning keys or index/key pairs. See
          :meth:`RiakClient.get_index()
          <riak.client.RiakClient.get_index>` for more details.
          """
          return self._client.get_index(self, index, startkey, endkey,
                                        return_terms=return_terms,
                                        max_results=max_results,
                                        continuation=continuation,
                                        timeout=timeout, term_regex=term_regex)